One-piece plunger body



July 26, 1927. Y

H. M. GREEN ONE-PIECE PLUNGER BODY VV/// A y 4 vi, a g Z w m N Patented July 26, 1927 UNITED STATES PATENT OFFICE.

EENEY It. GREEN, or foe ANGELES, oALIroENIA; PACIFIC SOUTHWEST 'rntrs'r s SAV- INGS BANK, ADMINISTRATOR or SAID H. M. GREEN, DECEASED, SSIeNoE 'ro ONE-PIECE PLUNGER BODY.

Application filed July 20, 1925, Serial No. 44,851. Renewed May 31, 1927.

the load lifted up on the up stroke of the plunger.

An object is to provide a one-piece plunger body and a series of spaced stacks pfpacking rings therealong each acting independent of the other.

Other objects and advantages will be made manifest in the following specification of an embodiment of the invention here illustrated; it being understood that modifications, va-

riations and adaptations may be resorted to within the spirit of the invention and its scope as it is here claimed.

Figure 1 is a longitudinal section of the plunger in its barrel.

Figure 2 is a plan of one of the packing rin S.

'I he plunger, which is shown as in a barrel B, has a tubular body 2 whose upper end i is threaded to receive a valve cage O of any ap ropriate type.

Rt suitable distances along the body 2 are circumferential shoulders 3 nearly touching the barrel surface and forming top end stops for subjacent stacks of packing rings 4, each of which is s lit so as to be passed around the body an the body. I

Above each shoulder 3 the body is of conical form 5 flaring toward its base shoulder I 3 so that as the imposed packing rings 4 externally, or peripherally, wear and move down on the wedge part they are expanded out against the barrel. The conical part 5 merges into a cylindrical part 6 along which lies a reserve part of the stack of rings 4.

The bottom of the plunger may have a working valve V under a stop pin 10.

The action of the plunger Is as follows: When working in the barrel B, the up internally closing on 7 stroke of the plunger will lift the column of liquid and a part of the load weight is taken the difierent stacks.

up by the exposed, upper packing rings in This load imposed on the packing drives it down onto the expanding wedge or conical parts 5 which at once thrust the near rings 4 outward toward the barrel. On a reverse or down stroke of the plunger the free packing may slide or tend to slide (relatively) on the plunger body toward the shoulder 3. On the up stroke the packing again picks up the load and is forced out against the barrel by the conical body portions and made effective to prevent l:ak.past the plunger.

All springs are eliminated and the body 2 consists of but one piece having integral spaced shoulders and wedges to expand'the packing rings when these take up the load.

What is claimed is:

1. A pump plunger having a one piece tubular body having cylindrical portions provided with longitudinally spaced, annular, external shoulders and conical base portions opposed to the shoulders, and stacks of packing arranged between the shoulders and expansively acted upon. by the said conical portions under load; said packing being free to work between the shoulders as the packing wears down.

2. A pump plunger having a one piece tubular body provided with longitudinally spaced, annular, external shoulders and conical base portions opposed to the shoulders, and stacks of packing arranged between the shoulders-and expansively acted upon by the Said conical portions under load: said packing being free to work between the shoulders as the packing wears down; the

body including cylindrical portions between the shoulders and the conical portions for reserve packing not on the conical portions.

3. A pump plunger having a tubular body provided with longitudinally spaced, annular, external shoulders having stop faces on one side and having conical bases curved out to the rims of the shoulders on the opposite side, and stacks of packing freely movable on the body between opposed shoulders and ponical base portions and expanded by the atter'.

HENRY M. GREEN. 

